US3428341A - Flexible duct coupling for air diffusing system - Google Patents

Flexible duct coupling for air diffusing system Download PDF

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Publication number
US3428341A
US3428341A US605049A US3428341DA US3428341A US 3428341 A US3428341 A US 3428341A US 605049 A US605049 A US 605049A US 3428341D A US3428341D A US 3428341DA US 3428341 A US3428341 A US 3428341A
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United States
Prior art keywords
connector
collar
housing
flexible duct
duct
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Expired - Lifetime
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US605049A
Inventor
Theodore Mueller
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Emerson Electric Co
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Emerson Electric Co
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/24—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with parts screwed directly on or into the hose
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
    • F16L25/14—Joints for pipes of different diameters or cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/0218—Flexible soft ducts, e.g. ducts made of permeable textiles

Definitions

  • FIG. 5 I I I I I I I I I I I /7 l I l I I I I l FIG. 5
  • the end of the duct is fitted within the compass of the lip, by compressing it radially, inserting the end, and permitting it to expand in such a way that at least one full turn of the coil is within the collar, the lip engaging the flexible covering to form a seal and the coil crossing the lip at one place.
  • This invention relates to an air distributing system and particularly to connecting means for joining a flexible air duct to a sheet metal housing, as for example a metal distributing or proportionating duct or an air diffuser.
  • the flexible duct for use in this invention normally comprises a helical coil or skeleton or resilient material and a flexible covering. Numerous flexible ducts of this general type are known.
  • One of the objects of this invention is to provide a connector for connecting a flexible duct to a sheet metal housing which holds the flexible duct tightly and without slipping, and provides a good air seal without the use of tape.
  • Another object is to provide such a connector which will conform a normally circular flexible duct to the shape of elliptical or other shaped openings in the housing, as well as circular openings.
  • Another object is to provide such a connector which is extremely simple to use, and inexpensive to manufacture.
  • a connector for connecting the duct to a housing, the connector comprising a collar connected at one edge to the housing and having an inwardly turned lip around its other edge.
  • the flexible duct rather than fitting around the outside of the collar, fits within the collar and is held by the interaction of the inwardly turned lip and the helical coil of the flexible duct.
  • the inner circumference of the lip 3,428,341 Patented Feb. 18, 1969 of the collar is preferably equal to pi times the nominal inner diameter of the flexible duct.
  • FIGURE 1 is a view in front elevation of one embodiment of the connector of this invention
  • FIGURE 2 is a sectional view taken along the line 2-2 of FIGURE 1;
  • FIGURE 3 is a view in front elevation of another embodiment of the connector of this invention.
  • FIGURE 4 is a sectional view taken along line 4-4 of FIGURE 3;
  • FIGURE 5 is a sectional view taken along line S-5 of FIGURE 3;
  • FIGURE 6 is a view in cross section of an air diffuser showing a connector of the embodiment shown in FIG URES 3-5;
  • FIGURE 7 is a sectional view, taken along the line 7-7, of still another embodiment of connector of this invention.
  • FIGURE 8 is a top plan view of the connector shown in FIGURE 7;
  • FIGURE 9 is a sectional view of still another embodiment of connector of this invention.
  • reference numeral 1 indicates a connector of this invention including a circular collar 2 having at its inner edge an integral outwardly turned flange 3 and at its outer edge a small inwardly turned circumferentially uninterrupted integral lip 4.
  • the flange 3 is provided with holes 5 to accommodate screws for attaching the connector 1 to a housing.
  • the lip 4 is preferably quite small.
  • the connector is made to accornmodate flexible ducts of approximately four inch to seven inch diameter the lip extends inwardly in the order of only At; of an inch.
  • the radius of curvature of the lip is typically of an inch.
  • the flange 3 may be attached to the housing with screws, not shown, driven into the housing through the holes 5, or in any other conventional way, with the flange either inside or outside the housing.
  • a flexible duct 20 is connected simply by compressing the end of the duct slightly, forcing at least one complete turn of a helix 21 of a helical coil 22 into the collar, and releasing the helix.
  • the lip 4 engages flexible covering 23 of the duct around the periphery of the duct, and though the helix of the coil crosses the lip at one place the resulting joint is air-tight and has remarkable resistance to dislodgement.
  • FIG- URES 3-6 Another embodiment of this invention is shown in FIG- URES 3-6.
  • a connector 11 has a collar 12 which in plan is in the shape of an ellipse.
  • An outwardly turned integral flange 13 at the inside edge of the collar 12 is given right angle bends along lines tangent to the topmost and bottommost points of the ellipse, to form inwardly extending shelves 17 in the plane of the collar.
  • Screw holes 15 are provided at the unbent ends of the flange.
  • An inwardly curled lip 14 at the outer edge of the connector 11 again has a inch radius of curvature 16 typically, and extends inwardly of an inch from the inside of the collar.
  • the connector 11 may be attached to a housing around an opening therein, as shown in FIG- URE 6, where it is attached to an air outlet manifold for a commercial air conditioning system.
  • the unbent part of the flange 13 is on the outside of the housing and is held to the housing by screws 19.
  • the shelves 17 project into the housing through an opening and serve to support insulation in the housing at the opening.
  • a connector 31 is provided which has in plan a simulated elliptical opening and a planar flange 33 as distinguished from the partly bent or wiped flange 13 of the embodiment shown in FIGURES 3-6.
  • a connector 41 is made integral with a housing 42 of an air manifold system.
  • a flexible duct completes the system and is compressed to pass a lip edge.
  • the connector of this invention can be made by drawing, spinning, stamping or other common and simple processes.
  • the helix in the flexible duct illustrated is made of round, plastic covered steel spring wire, it can be made of uncovered steel ribbon to which an impregnated cloth or plastic is secured by crimping of the ribbon edges, or of other suitably supportive material.
  • the flange for holding the connector to a housing can be varied to numerous shapes to fit the needs of a particular job and, as has been indicated by the embodiment shown in FIGURE 9, can be eliminated altogether.
  • the collar may be any desired rounded shape, and may be reduced in height, even to the place at which it is flush with the housing surface, though a projecting collar wall normally serves a sealing or bafliing function and tends to ensure that the interior of the housing is unobstructed by the inserted duct.
  • an air diffusing system including a sheet metal housing, the combination of a substantially circular flexible duct, said duct having a helical coil and a flexible covering around said helical coil, and a connector for attaching said flexible duct to said housing, said connector comprising a collar having an inner face, an outer face and an outer edge, said connector being connected to said housing and defining an opening therein and having along its outer edge an inwardly turned lip, said lip having an annular circumferentially continuous inner edge lying in substantially a single plane and having an inner circumference on the order of pi times the nominal inner diameter of the said flexible duct, the helical coil of the free end of said flexible duct being compressed normally radially and inserted into the said collar and released, at least one full turn of the coil extending within said collar, the coil being caught by said lip with said lip engaging the flexible covering of said duct to form a seal and the coil crossing the lip at one place.

Description

T. MUELLER Feb. 18,1969
FLEXIBLE DUCT COUPLING FOR AIR DIFFUSING SYSTEM Sheet Filed Dec. 2'7, 1966 FIG. '2
Feb..l8, 1969 I T. MUELLER I 3,428,341
FLEXIBLE DUCT COUPLING FOR AIR DIFFUSING SYSTEM Filed Deg. 27, 1966 Sheet 2 of 3 f7 I FIG. 4
I I I I I I I /7 l I l I I I I l FIG. 5 FIG. 5
Dmrerffma THEODOPE MUE LL El? T. MUELLER 3,428,341
R AIR QIF'FUSlNG SYSTEM FLEXIBLE DUCT COUPLING F0 Filed Dec. 27, 1966 FIGS United States Patent 7 Claims ABSTRACT OF THE DISCLOSURE The combination of circular flexible duct of the type having a helical coil of resilient material covered with a flexible covering and a connecting collar for connecting the duct with a sheet metal housing, the collar having an inwardly turned circumferentially uninterrupted annular lip, the inner edge of which lies in substantially a single plane and defines an opening the circumference of which is approximately equal to pi times the nominal inner diameter of the duct. The end of the duct is fitted within the compass of the lip, by compressing it radially, inserting the end, and permitting it to expand in such a way that at least one full turn of the coil is within the collar, the lip engaging the flexible covering to form a seal and the coil crossing the lip at one place.
BACKGROUND OF THE INVENTION This invention relates to an air distributing system and particularly to connecting means for joining a flexible air duct to a sheet metal housing, as for example a metal distributing or proportionating duct or an air diffuser. The flexible duct for use in this invention normally comprises a helical coil or skeleton or resilient material and a flexible covering. Numerous flexible ducts of this general type are known.
Heretofore, when a flexible duct was to be connected to a sheet metal housing at an opening in the housing, the housing has been provided with a nipple or sleeve around the opening, the sleeve being of slightly smaller diameter than the flexible duct, and the flexible duct has been pulled over the sleeve and held in position with an adhesive tape, or the like, sometimes by a clamp and sometimes just by a screw or screws through the wall of the duct and into the sleeve. This type of connection often has not proved very satisfactory, because the flexible duct cannot be held very securely and because careful taping has proved necessary to provide a good air seal.
One of the objects of this invention is to provide a connector for connecting a flexible duct to a sheet metal housing which holds the flexible duct tightly and without slipping, and provides a good air seal without the use of tape.
Another object is to provide such a connector which will conform a normally circular flexible duct to the shape of elliptical or other shaped openings in the housing, as well as circular openings.
Another object is to provide such a connector which is extremely simple to use, and inexpensive to manufacture.
In accordance with this invention, generally stated, in combination with a circular flexible duct with a helical coil covered with a flexible material, a connector is provide for connecting the duct to a housing, the connector comprisinga collar connected at one edge to the housing and having an inwardly turned lip around its other edge. The flexible duct, rather than fitting around the outside of the collar, fits within the collar and is held by the interaction of the inwardly turned lip and the helical coil of the flexible duct. The inner circumference of the lip 3,428,341 Patented Feb. 18, 1969 of the collar is preferably equal to pi times the nominal inner diameter of the flexible duct.
BRIEF DESCRIPTION OF THE DRAWING In the drawings, FIGURE 1 is a view in front elevation of one embodiment of the connector of this invention;
FIGURE 2 is a sectional view taken along the line 2-2 of FIGURE 1;
FIGURE 3 is a view in front elevation of another embodiment of the connector of this invention;
FIGURE 4 is a sectional view taken along line 4-4 of FIGURE 3;
FIGURE 5 is a sectional view taken along line S-5 of FIGURE 3;
FIGURE 6 is a view in cross section of an air diffuser showing a connector of the embodiment shown in FIG URES 3-5;
FIGURE 7 is a sectional view, taken along the line 7-7, of still another embodiment of connector of this invention;
FIGURE 8 is a top plan view of the connector shown in FIGURE 7; and
FIGURE 9 is a sectional view of still another embodiment of connector of this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIGURES l and 2 for one illustrative embodiment of this invention, reference numeral 1 indicates a connector of this invention including a circular collar 2 having at its inner edge an integral outwardly turned flange 3 and at its outer edge a small inwardly turned circumferentially uninterrupted integral lip 4. The flange 3 is provided with holes 5 to accommodate screws for attaching the connector 1 to a housing. The lip 4 is preferably quite small. When the connector is made to accornmodate flexible ducts of approximately four inch to seven inch diameter the lip extends inwardly in the order of only At; of an inch. Thus with nominal 5 inch inner diameter ducts the inner diameter of the collar 2 is 5% inches and the inner diameter of the lip 4 is 5 inches. The radius of curvature of the lip, as shown at 6 in FIGURE 2, is typically of an inch.
The flange 3 may be attached to the housing with screws, not shown, driven into the housing through the holes 5, or in any other conventional way, with the flange either inside or outside the housing. As shown particularly in FIGURE 6, a flexible duct 20 is connected simply by compressing the end of the duct slightly, forcing at least one complete turn of a helix 21 of a helical coil 22 into the collar, and releasing the helix. The lip 4 engages flexible covering 23 of the duct around the periphery of the duct, and though the helix of the coil crosses the lip at one place the resulting joint is air-tight and has remarkable resistance to dislodgement.
Another embodiment of this invention is shown in FIG- URES 3-6. In this embodiment a connector 11 has a collar 12 which in plan is in the shape of an ellipse. An outwardly turned integral flange 13 at the inside edge of the collar 12 is given right angle bends along lines tangent to the topmost and bottommost points of the ellipse, to form inwardly extending shelves 17 in the plane of the collar. Screw holes 15 are provided at the unbent ends of the flange. An inwardly curled lip 14 at the outer edge of the connector 11 again has a inch radius of curvature 16 typically, and extends inwardly of an inch from the inside of the collar. The connector 11 may be attached to a housing around an opening therein, as shown in FIG- URE 6, where it is attached to an air outlet manifold for a commercial air conditioning system. The unbent part of the flange 13 is on the outside of the housing and is held to the housing by screws 19. The shelves 17 project into the housing through an opening and serve to support insulation in the housing at the opening.
In the embodiment shown in FIGURES 7 and 8, a connector 31 is provided which has in plan a simulated elliptical opening and a planar flange 33 as distinguished from the partly bent or wiped flange 13 of the embodiment shown in FIGURES 3-6.
In the embodiment shown in FIGURE 9, a connector 41 is made integral with a housing 42 of an air manifold system.
In every embodiment, a flexible duct completes the system and is compressed to pass a lip edge.
The connector of this invention can be made by drawing, spinning, stamping or other common and simple processes.
Numerous variations in the system of this invention will occur to those skilled in the art in the light of the foregoing disclosure. For example, while the helix in the flexible duct illustrated is made of round, plastic covered steel spring wire, it can be made of uncovered steel ribbon to which an impregnated cloth or plastic is secured by crimping of the ribbon edges, or of other suitably supportive material. The flange for holding the connector to a housing can be varied to numerous shapes to fit the needs of a particular job and, as has been indicated by the embodiment shown in FIGURE 9, can be eliminated altogether. Likewise, the collar may be any desired rounded shape, and may be reduced in height, even to the place at which it is flush with the housing surface, though a projecting collar wall normally serves a sealing or bafliing function and tends to ensure that the interior of the housing is unobstructed by the inserted duct.
Having thus described the invention, what is claimed and desired to be secured by Letters Patent is:
1. In an air diffusing system including a sheet metal housing, the combination of a substantially circular flexible duct, said duct having a helical coil and a flexible covering around said helical coil, and a connector for attaching said flexible duct to said housing, said connector comprising a collar having an inner face, an outer face and an outer edge, said connector being connected to said housing and defining an opening therein and having along its outer edge an inwardly turned lip, said lip having an annular circumferentially continuous inner edge lying in substantially a single plane and having an inner circumference on the order of pi times the nominal inner diameter of the said flexible duct, the helical coil of the free end of said flexible duct being compressed normally radially and inserted into the said collar and released, at least one full turn of the coil extending within said collar, the coil being caught by said lip with said lip engaging the flexible covering of said duct to form a seal and the coil crossing the lip at one place.
2. The connector of claim 1 wherein the collar has an inner edge along which an outwardly turned flange extends, said flange being attached to said housing.
3. The connector of claim 2 wherein said lip is integral with said collar.
4. The connector of claim 3 wherein the collar is a round band.
5. The connector of claim 3 wherein the collar is an elliptical band.
6. The connector of claim 1 wherein said lip extends inwardly about of an inch beyond the inner face of said collar.
7. The connector of claim 1 wherein the collar is integral with the housing.
References Cited UNITED STATES PATENTS 1,099,833 6/1914 White 285-238 X 1,274,438 8/1918 Nettleton 285-260 2,366,067 12/1944 Smith 285-260 X 2,507,535 5/1950 Madsen.
2,567,773 9/1951 Krupp 285-260 X 2,984,503 5/1961 Cunningham 285-260 3,131,954 5/1964 Kramer et al. 285-238 3,168,382 2/1965 Chambers et al. 285-7 X 3,172,399 3/1965 Lentz et al. 285-238 X THOMAS F. CALLAGHAN, Primary Examiner.
US. Cl. X.R.
US605049A 1966-12-27 1966-12-27 Flexible duct coupling for air diffusing system Expired - Lifetime US3428341A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002197A2 (en) * 1977-11-25 1979-06-13 Georg Röhl Lichttechnische Spezialfabrik Apparate- und Gerätebau GmbH & Co KG Process for the manufacture of a venting or aerating conduit, applications of the process and pipe suitable for application of the process
FR2839137A1 (en) * 2002-04-29 2003-10-31 Cie Ind D Applic Thermiques Ci Connector for end of heating or air conditioning duct has oblong cross-section made up of two curved halves with peripheral flange and is made by bending metal sheet and fastening its ends together
US11131477B2 (en) 2018-03-15 2021-09-28 Nationwide Tarps, Inc. Connector for flexible duct, flexible duct with interchangeable end, and method thereof

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1099833A (en) * 1913-12-20 1914-06-09 Wolf Company Sifter and bolter.
US1274438A (en) * 1914-11-17 1918-08-06 Stanley Nettleton Means for ventilating mine-workings and the like.
US2366067A (en) * 1943-06-04 1944-12-26 Smith Franklin Elijah Hose coupling
US2507535A (en) * 1946-04-03 1950-05-16 Scamless Rubber Company Connector
US2567773A (en) * 1947-12-18 1951-09-11 Goodrich Co B F Hose coupling
US2984503A (en) * 1957-04-11 1961-05-16 Us Rubber Co Cord fabric downspout
US3131954A (en) * 1959-09-04 1964-05-05 Crushproof Tubing Co Rubber tube with enclosed metal ring
US3168382A (en) * 1961-04-06 1965-02-02 Sunbeam Corp Hair drier improvements
US3172399A (en) * 1961-12-13 1965-03-09 Walker Mfg Co Exhaust system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1099833A (en) * 1913-12-20 1914-06-09 Wolf Company Sifter and bolter.
US1274438A (en) * 1914-11-17 1918-08-06 Stanley Nettleton Means for ventilating mine-workings and the like.
US2366067A (en) * 1943-06-04 1944-12-26 Smith Franklin Elijah Hose coupling
US2507535A (en) * 1946-04-03 1950-05-16 Scamless Rubber Company Connector
US2567773A (en) * 1947-12-18 1951-09-11 Goodrich Co B F Hose coupling
US2984503A (en) * 1957-04-11 1961-05-16 Us Rubber Co Cord fabric downspout
US3131954A (en) * 1959-09-04 1964-05-05 Crushproof Tubing Co Rubber tube with enclosed metal ring
US3168382A (en) * 1961-04-06 1965-02-02 Sunbeam Corp Hair drier improvements
US3172399A (en) * 1961-12-13 1965-03-09 Walker Mfg Co Exhaust system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0002197A2 (en) * 1977-11-25 1979-06-13 Georg Röhl Lichttechnische Spezialfabrik Apparate- und Gerätebau GmbH & Co KG Process for the manufacture of a venting or aerating conduit, applications of the process and pipe suitable for application of the process
EP0002197A3 (en) * 1977-11-25 1979-07-25 Georg Röhl Lichttechnische Spezialfabrik Apparate- und Gerätebau GmbH & Co KG Process for the manufacture of a venting or aerating conduit, applications of the process and pipe suitable for application of the process
FR2839137A1 (en) * 2002-04-29 2003-10-31 Cie Ind D Applic Thermiques Ci Connector for end of heating or air conditioning duct has oblong cross-section made up of two curved halves with peripheral flange and is made by bending metal sheet and fastening its ends together
US11131477B2 (en) 2018-03-15 2021-09-28 Nationwide Tarps, Inc. Connector for flexible duct, flexible duct with interchangeable end, and method thereof
US11965669B2 (en) 2018-03-15 2024-04-23 Nti Global Flexible duct with interchangeable end, connector for flexible duct, and method thereof

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